package com.erp.hibernate.dao;

import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.Criteria;
import org.hibernate.LockMode;
import org.hibernate.Session;
import org.hibernate.criterion.Order;
import org.hibernate.criterion.Projections;
import org.springframework.context.ApplicationContext;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import com.erp.Struts.common.Pager;
import com.erp.hibernate.beans.Employee;

/**
 * A data access object (DAO) providing persistence and search support for
 * Employee entities. Transaction control of the save(), update() and delete()
 * operations can directly support Spring container-managed transactions or they
 * can be augmented to handle user-managed Spring transactions. Each of these
 * methods provides additional information for how to configure it for the
 * desired type of transaction control.
 * 
 * @see com.erp.hibernate.dao.Employee
 * @author MyEclipse Persistence Tools
 */

public class EmployeeDAO extends HibernateDaoSupport {
	private static final Log log = LogFactory.getLog(EmployeeDAO.class);
	// property constants
	public static final String EMPLOYEEID = "employeeid";
	public static final String NAME = "name";
	public static final String PASSWORD = "password";
	public static final String ENABLED = "enabled";

	protected void initDao() {
		// do nothing
	}

	public void save(Employee transientInstance) {
		log.debug("saving Employee instance");
		try {
			getHibernateTemplate().save(transientInstance);
			log.debug("save successful");
		} catch (RuntimeException re) {
			log.error("save failed", re);
			throw re;
		}
	}
	
	public void update(Employee transientInstance) {
		log.debug("saving employee instance");
		try {
			getHibernateTemplate().update(transientInstance);
			log.debug("save successful");
		} catch (RuntimeException re) {
			log.error("save failed", re);
			throw re;
		}
	}

	public void delete(Employee persistentInstance) {
		log.debug("deleting Employee instance");
		try {
			getHibernateTemplate().delete(persistentInstance);
			log.debug("delete successful");
		} catch (RuntimeException re) {
			log.error("delete failed", re);
			throw re;
		}
	}

	public Employee findById(java.lang.Integer id) {
		log.debug("getting Employee instance with id: " + id);
		try {
			Employee instance = (Employee) getHibernateTemplate().get(
					"com.erp.hibernate.beans.Employee", id);
			return instance;
		} catch (RuntimeException re) {
			log.error("get failed", re);
			throw re;
		}
	}

	public List findByExample(Employee instance) {
		log.debug("finding Employee instance by example");
		try {
			List results = getHibernateTemplate().findByExample(instance);
			log.debug("find by example successful, result size: "
					+ results.size());
			return results;
		} catch (RuntimeException re) {
			log.error("find by example failed", re);
			throw re;
		}
	}

	public List findByProperty(String propertyName, Object value) {
		log.debug("finding Employee instance with property: " + propertyName
				+ ", value: " + value);
		try {
			String queryString = "from Employee as model where model."
					+ propertyName + "= ?";
			return getHibernateTemplate().find(queryString, value);
		} catch (RuntimeException re) {
			log.error("find by property name failed", re);
			throw re;
		}
	}

	public List findByEmployeeid(Object employeeid) {
		return findByProperty(EMPLOYEEID, employeeid);
	}

	public List findByName(Object name) {
		return findByProperty(NAME, name);
	}

	public List findByPassword(Object password) {
		return findByProperty(PASSWORD, password);
	}

	public List findByEnabled(Object enabled) {
		return findByProperty(ENABLED, enabled);
	}

	public List findAll() {
		log.debug("finding all Employee instances");
		try {
			String queryString = "from Employee";
			return getHibernateTemplate().find(queryString);
		} catch (RuntimeException re) {
			log.error("find all failed", re);
			throw re;
		}
	}

	public Employee merge(Employee detachedInstance) {
		log.debug("merging Employee instance");
		try {
			Employee result = (Employee) getHibernateTemplate().merge(
					detachedInstance);
			log.debug("merge successful");
			return result;
		} catch (RuntimeException re) {
			log.error("merge failed", re);
			throw re;
		}
	}

	public void attachDirty(Employee instance) {
		log.debug("attaching dirty Employee instance");
		try {
			getHibernateTemplate().saveOrUpdate(instance);
			log.debug("attach successful");
		} catch (RuntimeException re) {
			log.error("attach failed", re);
			throw re;
		}
	}

	public void attachClean(Employee instance) {
		log.debug("attaching clean Employee instance");
		try {
			getHibernateTemplate().lock(instance, LockMode.NONE);
			log.debug("attach successful");
		} catch (RuntimeException re) {
			log.error("attach failed", re);
			throw re;
		}
	}

	public static EmployeeDAO getFromApplicationContext(ApplicationContext ctx) {
		return (EmployeeDAO) ctx.getBean("EmployeeDAO");
	}

	public Employee getEmployee(String username, String password) {
		Employee instance = new Employee();
		instance.setEmployeeid(username);
		instance.setPassword(password);
		List em = this.findByExample(instance);
		if(em.size() != 0){
			return (Employee)em.get(0);
		}
		return null;
	}
	
	public Pager findPager(final int pageSize,
			final int pageNo) {
		Session session = getHibernateTemplate().getSessionFactory().openSession();
		
		// set query condition
		Criteria criteria = session.createCriteria(Employee.class);
		
		// get total count
		int rowCount = ((Integer) criteria.setProjection(
				Projections.rowCount()).uniqueResult()).intValue();
		criteria.setProjection(null);
		
		// get current page list
		int startIndex = pageSize * (pageNo - 1);
		criteria.setFirstResult(startIndex);
		criteria.setMaxResults(pageSize);
		List result = criteria.list();
		
		session.close();

		return new Pager(pageSize, pageNo, rowCount, result);
	}
}